Choose the sentence that uses the correct question tag:

The correct answer is Option (3) → I am on the cleaning duty list this Sunday, aren’t I?

Question tag after “I am”:

A positive sentence with “I am” takes the negative tag “aren’t I”.

Why the Other Options are Incorrect?

Option 1: Rekha sings bhajans at the temple every evening, isn’t she? — Incorrect. The given sentence says “sings”. It has no helping verb, so the tag must use “does”, not “is”.
Corrected: Rekha sings bhajans at the temple every evening, doesn’t she?

Option 2: The tailor hasn’t stitched my kurta yet, hasn’t he? — Incorrect. The sentence has “hasn’t”, so it is negative. A negative sentence takes a positive tag.
Corrected: The tailor hasn’t stitched my kurta yet, has he?

Option 4: Ananya’s grandfather walks to the park every morning, doesn’t she? — Incorrect. The tag uses the pronoun for the subject. The subject is “grandfather”, not “Ananya”. So the pronoun is “he”.
Corrected: Ananya’s grandfather walks to the park every morning, doesn’t he?